That should have removed quite a few files from your HD !!
If you have no .gz log files and they are many MB´s, that means logrotate does not do its job! Logrotate is a cron-job, a maintenance job that is performed every night between 3:00 and 4:00 AM. If your computer is not on 24/7 you should install anacron to do the maintenance at boot.
If you can´t find anacron on your Cds, get anacron: Here and take the top one ( for made in Linux . . anacron-2.3-9mlx.i386.rpm ) download it and just install it by double clicking.
!! Anacron makes that your computer shows heavy activity 3 - 5 minutes after you boot up in the morning (afternoon). The activity is for about 5 minutes, so nothing to be worried about - no hacker´s activity - all normal maintenance jobs !!
One last tip: anacron needs no configuring, it should be pre-configured and run automatically . .
-- Jul 6 2003 ( Revised Dec 12 2005 ) --